The striped one looks like a male. Males have bumps on their heads and he looks to have a bump.the front fins on a male will be forked and while they arent forked yet they are jagged. Males will be more circular females more angular.
The other ones head bumb isnt protruded and looks to have smooth front fins so may be female.
If it is a male and female if they arent bonded they may fight. Sorry thought these were 2 angels not 4. Yeah the 2 darker ones look like males the lighter yellow ones look like females.
